package com.rd.student.jiaji.class3.wangyanbo.task24;

import java.util.Random;
import java.util.concurrent.Semaphore;

public class TestSemaphore {
    private static Semaphore semaphore= new Semaphore(20);

    public static void main(String[] args) {
        //模拟50辆车 车进车出的场景
        for (int i = 0; i < 50; i++) {
            Thread thread=new Thread(new Runnable() {
                @Override
                public void run() {
                    System.out.println(Thread.currentThread().getName()
                    +"来到停车场");
                    //返回可用的令牌数量
                    //返回可用的车位数
                    if( semaphore.availablePermits()==0){
                        System.out.println("车位不足，请稍等");
                    }
                    try {
                        //获取车位
                        semaphore.acquire();
                        System.out.println(Thread.currentThread().getName()
                                +"进入停车场");
                        Thread.sleep(new Random().nextInt(8888));
                        System.out.println(Thread.currentThread()
                                .getName()+"开出停车场");
                        //释放车位
                        semaphore.release();
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }

                }
            });
            thread.start();

        }
    }
}
